I found the mistake in display letter "ư" in VNmese. Many abstract display "&w;" instead of "ư".
I checked it in original website and it display is OK.
(
http://iplib.noip.gov.vn/WebUI/WDetailPAT.php?intRecNum=1&HitListViewMode=Compact&ref=or
http://iplib.noip.gov.vn/WebUI/WSearchPAT.php)
Please see the attached the Search screen how I made the querry and the Result screen in which letter "&w;" is hightlited.
The captured screen is just an example, pls check all in "Abstract field" in your database
I found the letter "ư" display OK in Title (which I marked in blue)
Regards!